Lock.



PATENTED SEPT. I0, 1907.

P. MLLER.

LOCK.

APPLICATION FILED APB. e. 1907.

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UNTTED STATES PAUL MLLER, OF BRESLAU, GERMANY.

LOCK.

No. 865,421.V

Specification of Letters Patent.

Patented sept. 1o, i907.

Application iiled April 6,1907 Serial No. 366,766.

To all whom it lmay concern:

Be it known that L, PAUL MLLER, a subject ol'v the German Emperor, residing at Breslau, Germany, have invented certa-in new and uselul Improvements in Locks, ol' which the l'ollowing is a statement.

rlhis invention relates to a safety lock, having a main key which is built inthe lock case and is itseli locked by tumblers. This lock differs from other known locks of the same type since the tumblers securing the main key can only be disengaged therefrom by means of a second or auxiliary key which is introduced through a special key hole.

The invention is illustrated in the annexed drawing in which Figure l shows the lock in the open position with the second or auxiliary key inserted, Fig. 2 is a section on the line AA oi Fig. l; Fig. 3 shows on a larger scale the positions ol' the parts alter one turn ol the main key; Fig. 4 is section on the line B-B o Fig. 3, Fig. 5 is a side view oi the main key, and Fig. 6 a side view ol the auxiliary key.

a is the main key, which is inclosed in the loekcase. For security against unauthorized turning, this key is provided with two recesses a1, which-can be entered by projections b1 ol the tumblers b placed below them and acted on by the auxiliary key c. It' the auxiliary key c is turned to the right, the tuinblers b are depressed by the bit c1 ol this key c, and the projections b1 are thus removed l'rom the recesses a1 so that the main key n can be turned by means oi a removable handle engaging its squared end. The tumbler d is by this means operated and at the same time the bolt e is shot. Fig. l shows the position oi the bolt after one complete turn ol' the key a to the right. Aiter the second turirthe key bit a2 ol` key a also acts on the double-armed lever g lulerumed at f to the bolt e, and by this means pushes back the latch h which is thrust back to its normal position by the spring t' when the key bit has cleared the lever g,

The unauthorized opening oi the lock by means ot a l'alse key, can be prevented by suitable known arrangements, one ol which is shown in the drawing.

For this purpose projections b2 and (Z2 may be provided on the tumblers b and d; adjacent these projections there are arranged rotatable pins k and Z, provided with recesses k1 and Z1 adapted to be entered by the projections b2 and d2. Ii the pins la, or even only one of them, is or are turned by means of a suitable implement the key c cannot be turned to unlock the main key, the movement of the tumblers b being prevented. It in addition to the pins c the pins Z are rotated the lock cannot be opened even ii an unauthorized person should by repeated attempts succeed in properly adjusting the pins 7c to disengage the tumbler b, because the upward movement oi the tumbler fl and the turning oi the principal key to thrust back the bolt c would be prevented.

What I claim as my invention and desire to secure by Lett-ers Patent oi the United States is:-

l. In a lock the combination of a lock case, a dead bolt, tumbler-s therefor, a rotatable main key inclosed in the lock case and retained thereby adapted on revolution to operate the dead bolt, further tumblers for engaging said main key and locking it against revolution, and means permitting a removable auxiliary key to retract said further tumhlers.

2. In a lock the combination ot' a lock case, a dead bolt, tuinblers therefor, a rotatable main key inclosed in the lock case and retained thereby adapted on revolution to operate the dead bolt, further tumblers for engaging said main key and locking it against revolutiony means permitting a removable auxiliary key to retract said further tumblers, a lever pivoted to the dead bolt and a latch adapted to be operated by movement of said lever when within the circle described by the main key bit.

3. In a lock the combination of a lock case, a dead holt, tumblers therefor, a rotatable main key inclosed in the lock case and retained thereby adapted on revolution to operate the dead bolt, further tumblers for engaging said main key and locking it against revolution, means permitting a removable auxiliary key to retract said further tuinblers and rotatable recessed pins operating to prevent disengagement movement of the tumblers.

In witness whereot` I have signed this specification in the presence of t'wo'witnesses.

PAUL MLLER.

Witnesses HERMANN MENZ, EnNs'i Klvrz. 

